enum without a fixed underlying type is set to a value outside the range of
the enumeration's values. Fixes
`Issue 50055: <https://github.com/llvm/llvm-project/issues/50055>`_.
+- Clang will now check compile-time determinable string literals as format strings.
+ This fixes `Issue 55805: <https://github.com/llvm/llvm-project/issues/55805>`_.
Non-comprehensive list of changes in this release
-------------------------------------------------
llvm::SmallBitVector &CheckedVarArgs, UncoveredArgHandler &UncoveredArg,
bool IgnoreStringsWithoutSpecifiers);
+static const Expr *maybeConstEvalStringLiteral(ASTContext &Context,
+ const Expr *E);
+
// Determine if an expression is a string literal or constant string.
// If this function returns false on the arguments to a function expecting a
// format string, we will usually need to emit a warning.
}
}
}
-
+ if (const auto *SLE = maybeConstEvalStringLiteral(S.Context, E))
+ return checkFormatStringExpr(S, SLE, Args, APK, format_idx, firstDataArg,
+ Type, CallType, /*InFunctionCall*/ false,
+ CheckedVarArgs, UncoveredArg, Offset,
+ IgnoreStringsWithoutSpecifiers);
return SLCT_NotALiteral;
}
case Stmt::ObjCMessageExprClass: {
}
}
+// If this expression can be evaluated at compile-time,
+// check if the result is a StringLiteral and return it
+// otherwise return nullptr
+static const Expr *maybeConstEvalStringLiteral(ASTContext &Context,
+ const Expr *E) {
+ Expr::EvalResult Result;
+ if (E->EvaluateAsRValue(Result, Context) && Result.Val.isLValue()) {
+ const auto *LVE = Result.Val.getLValueBase().dyn_cast<const Expr *>();
+ if (isa_and_nonnull<StringLiteral>(LVE))
+ return LVE;
+ }
+ return nullptr;
+}
+
Sema::FormatStringType Sema::GetFormatStringType(const FormatAttr *Format) {
return llvm::StringSwitch<FormatStringType>(Format->getType()->getName())
.Case("scanf", FST_Scanf)
t::func4("Hello %s"); // expected-warning {{more '%' conversions than data arguments}}
}
}
+#if __cplusplus >= 201103L
+namespace evaluated {
+
+constexpr const char *basic() {
+ return
+"%s %d"; // expected-note {{format string is defined here}}
+}
+
+constexpr const char *correct_fmt() {
+ return
+"%d %d";
+}
+
+constexpr const char *string_linebreak() {
+ return
+"%d %d"
+"%d %s"; // expected-note {{format string is defined here}}
+}
+
+/*non-constexpr*/ const char *not_literal() {
+ return
+"%d %d"
+"%d %s";
+}
+
+constexpr const char *inner_call() {
+ return "%d %s"; // expected-note {{format string is defined here}}
+}
+
+constexpr const char *wrap_constexpr() {
+ return inner_call();
+}
+
+
+void f() {
+ printf(basic(), 1, 2); // expected-warning {{format specifies type 'char *' but the argument has type 'int'}}
+ printf(correct_fmt(), 1, 2);
+ printf(string_linebreak(), 1, 2, 3, 4); // expected-warning {{format specifies type 'char *' but the argument has type 'int'}}
+ printf(not_literal(), 1, 2, 3, 4); // expected-warning {{format string is not a string literal}}
+ printf(wrap_constexpr(), 1, 2); // expected-warning {{format specifies type 'char *' but the argument has type 'int'}}
+}
+
+
+}
+#endif